2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2006
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "lib/events/events.h"
24 #include "cluster/cluster.h"
25 #include "system/filesys.h"
26 #include "cluster/cluster_private.h"
27 #include "lib/tdb/include/tdb.h"
28 #include "include/ctdb.h"
30 #include "lib/util/dlinklist.h"
31 #include "param/param.h"
32 #include "librpc/gen_ndr/misc.h"
34 /* a linked list of messaging handlers, allowing incoming messages
35 to be directed to the right messaging context */
36 struct cluster_messaging_list {
37 struct cluster_messaging_list *next, *prev;
38 struct cluster_state *state;
39 struct messaging_context *msg;
40 struct server_id server;
41 cluster_message_fn_t handler;
44 struct cluster_state {
45 struct ctdb_context *ctdb;
46 struct cluster_messaging_list *list;
53 return a server_id for a ctdb node
55 static struct server_id ctdb_id(struct cluster_ops *ops, uint32_t id)
57 struct cluster_state *state = (struct cluster_state *)ops->private;
58 struct ctdb_context *ctdb = state->ctdb;
59 struct server_id server_id;
60 server_id.node = ctdb_get_vnn(ctdb);
67 return a server_id as a string
69 static const char *ctdb_id_string(struct cluster_ops *ops,
70 TALLOC_CTX *mem_ctx, struct server_id id)
72 return talloc_asprintf(mem_ctx, "%u.%u", id.node, id.id);
76 this is an interim method for subsystems that have not yet been
77 converted to use the ctdb api. It opens a shared database in the
78 cluster temporary area, using TDB_CLEAR_IF_FIRST which relies on
79 correct operation of fcntl locks on the shared fileystem.
81 static struct tdb_wrap *ctdb_tdb_tmp_open(struct cluster_ops *ops,
82 TALLOC_CTX *mem_ctx, const char *dbname,
85 const char *dir = lp_parm_string(global_loadparm, NULL, "ctdb", "shared data");
89 DEBUG(0,("ERROR: You must set 'ctdb:shared data' to a cluster shared path\n"));
92 path = talloc_asprintf(mem_ctx, "%s/%s", dir, dbname);
93 w = tdb_wrap_open(mem_ctx, path, 0,
94 flags | TDB_CLEAR_IF_FIRST,
95 O_RDWR|O_CREAT, 0600);
101 get at the ctdb handle
103 static void *ctdb_backend_handle(struct cluster_ops *ops)
105 struct cluster_state *state = (struct cluster_state *)ops->private;
106 return (void *)state->ctdb;
109 struct ctdb_handler_state {
110 struct cluster_state *state;
111 cluster_message_fn_t handler;
112 struct messaging_context *msg;
116 dispatch incoming ctdb messages
118 static void ctdb_message_handler(struct ctdb_context *ctdb, uint64_t srvid,
119 TDB_DATA data, void *private)
121 struct ctdb_handler_state *s = talloc_get_type(private,
122 struct ctdb_handler_state);
124 blob.data = data.dptr;
125 blob.length = data.dsize;
126 s->handler(s->msg, blob);
129 static int ctdb_handler_destructor(struct ctdb_handler_state *s)
131 /* XXX - tell ctdb to de-register the message handler */
136 setup a handler for ctdb messages
138 static NTSTATUS ctdb_message_init(struct cluster_ops *ops,
139 struct messaging_context *msg,
140 struct server_id server,
141 cluster_message_fn_t handler)
143 struct cluster_state *state = (struct cluster_state *)ops->private;
144 struct ctdb_handler_state *h;
147 h = talloc(msg, struct ctdb_handler_state);
148 NT_STATUS_HAVE_NO_MEMORY(h);
151 h->handler = handler;
154 talloc_set_destructor(h, ctdb_handler_destructor);
156 /* setup a message handler */
157 ret = ctdb_set_message_handler(state->ctdb, server.id,
158 ctdb_message_handler, h);
160 DEBUG(0,("ctdb_set_message_handler failed - %s\n",
161 ctdb_errstr(state->ctdb)));
169 send a ctdb message to another node
171 static NTSTATUS ctdb_message_send(struct cluster_ops *ops,
172 struct server_id server, DATA_BLOB *data)
174 struct cluster_state *state = (struct cluster_state *)ops->private;
175 struct ctdb_context *ctdb = state->ctdb;
179 tdata.dptr = data->data;
180 tdata.dsize = data->length;
182 ret = ctdb_send_message(ctdb, server.node, server.id, tdata);
184 return NT_STATUS_INTERNAL_DB_CORRUPTION;
189 static struct cluster_ops cluster_ctdb_ops = {
190 .cluster_id = ctdb_id,
191 .cluster_id_string = ctdb_id_string,
192 .cluster_tdb_tmp_open = ctdb_tdb_tmp_open,
193 .backend_handle = ctdb_backend_handle,
194 .message_init = ctdb_message_init,
195 .message_send = ctdb_message_send,
199 /* initialise ctdb */
200 void cluster_ctdb_init(struct event_context *ev, const char *model)
202 struct cluster_state *state;
205 if (!lp_parm_bool(global_loadparm, NULL, "ctdb", "enable", false)) {
209 state = talloc(ev, struct cluster_state);
210 if (state == NULL) goto failed;
212 state->ctdb = ctdb_init(ev);
213 if (state->ctdb == NULL) goto failed;
215 ret = ctdb_socket_connect(state->ctdb);
217 DEBUG(0,(__location__ " Failed to connect to ctdb socket\n"));
222 state->vnn = ctdb_ctrl_getvnn(state->ctdb, timeval_zero(), CTDB_CURRENT_NODE);
223 if (state->vnn == (uint32_t)-1) {
224 DEBUG(0,(__location__ " Failed to get ctdb vnn\n"));
230 cluster_ctdb_ops.private = state;
232 cluster_set_ops(&cluster_ctdb_ops);
235 /* nasty hack for now ... */
237 void brl_ctdb_init_ops(void);
245 DEBUG(0,("cluster_ctdb_init failed\n"));